The term Black Sun is of esoteric or occult significance. It has been used by a variety of esotericists; for example, as the name of the well-known Black Sun Press of Mary Phelps Jacob, as well as in the in lyrics of the experimental music groups Coil and Death In June.
It also figures prominently as a symbol in Nazi mysticism. The shape of the symbol as used in Neo-Nazism is based on the design of a floor mosaic at Wewelsburg castle, in the room used by the SS for occult meetings.